"Smoking during pregnancy" was defined as smoking at least one cigarette a day every day during at least one trimester of pregnancy.
In this study, we applied the definition of smoking during pregnancy as proposed by Santos et al., 2008 [ 28], that is, smoking at least one cigarette a day every day during at least one trimester of pregnancy.
Of the 1,893 women from the cohort with a known offspring birth weight, 776 lived in the study area, < 5 km from an AQMS, during at least one trimester of pregnancy (431 and 158 women lived within 2 and 1 km of an AQMS, respectively).
In the question regarding nausea during pregnancy, we asked those who stated that they had been nauseous to specify the trimester of nausea, and permitted them to specify more than one trimester.
In Vietnam, pregnant women are recommended to have at least three ANC visits during the pregnancy, with one each trimester.
Women also collected three urine samples during pregnancy, one during each trimester.
These include cell proliferation during trimester one, cell migration and differentiation during trimester two, and cellular communication and neurotransmission during trimester three.
During pregnancy, SSRIs were most commonly purchased during the first trimester or one month before pregnancy (1.6%), with a declining prevalence as pregnancy advanced (0.8% of pregnant women in the second trimester and 0.7% in the third trimester).
We found only ten women with decidualised endometriomas who were managed expectantly during pregnancy, one had a first trimester miscarriage and so was not included in these results.
There were 11 reported exposures to azithromycin during the first trimester, resulting in one elective abortion, one ectopic pregnancy and 10 healthy, full-term babies[ 17].
